Steam-generator.



' I PATENTED FEB. 17, 1903. F. 0. WELLINGTON & 0:13. EDWARDS.

STEAM GENERATOR; APPLICATION FILED MAY z 1',-19o2'. no MODEL.BflfiIIETB-SHEBT 1.

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. No. 720,645. PATENTBD FEB. 17; 1903. F 0. WELLINGTON & G. B. EDWARDS.

STEAM GENERATOR APPLICATION FILED MAY 21, 1902. '7 no M01311. aSHEETS8HBET z.

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No. 720,645 PATENTED FEB. TI 1903. F. 0. WELLINGTON. &- G. B. EDWARDS.

STEAM GENERATOR.

APPLICATION EILE'D MAY 21,1902.

no MODEL. E'E EETE-EHEET s.

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UNITED STATES PATENT OFFICE.

FRANK O. WELLINGTONAND CHARLES B. EDWARDS, OF EAST BRAINTREE,MASSACHUSETTS, ASSIGNOR TO FORE RIVER SHIP AND ENGINE COM- PAN Y, OFQUINCY, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 720,645, dated February17, 1903.

Application filed May 21, 1902.

To all 1071,0711, it may concern:

Be it known that we, FRANK O. WELLING- TON and CHARLES B. EDWARDS,citizens of the United States, residing at East Braintree, in

the county of Norfolk and State of Massachusetts, have invented new anduseful Improvements in Steam-Generators, of which the following is aspecification.

This invention relates to improvements in IO steam generators or boilersof the class in which a steam drum or separator is connected towater-drums located beneath by bent tubes extending from saidwater-drumsto the bottom of said steam-generator, said tubes being I5 surrounded bya casing and forming by their arrangement the side walls of acombustionchamber above the grate.

The object of this invention is to provide a steam generator or boilerwhich shall secure the largest amount of eificiency in the small.-

est amount of space and which shall be of strong and durable andpractical construction and especially adapted for use in light vesselsin which high speed is required.

2 5 The invention consists, in a steam-generator, of a steam-drum, awater-drum located beneath said steam-drum and connected thereto by benttubes leading from said water-drum to the bottom of said steam-drum,said tubes 0 being so arranged that a portion of them will act asuptakes to feed the Water from said water-drum to said steam-drum andanotherportion will act as downtakes, securing a perfeet circulationbetween said water-drum and 5 said steam-drum, the uptake-tubes being soarranged as to act as a shield to the downtaketubes and prevent theheated gases and products of combustion from impinging against saiddowntake-tubes.

c The invention again consists in the instrumentalities hereinbefore setforth,the particular arrangement of the uptake and downtake tubesreferred to being such as to form a gaschamber between said two sets oftubes, said 5 gas-chamber forming an additional means for preventing theheated gases from coming in contact with or diffusing heat to thedowntake-tubes.

The invention again consists in the combi- 5o nation and arrangement ofparts set forth in Serial No. 108,356. (No model.)

the following specification and particularly pointed out in the claimsthereof.

Referring to the drawings, Figure 1 is a central longitudinal section,partly in elevation, of ourimproved steam-generator, taken 55. on line 11 of Fig. 2, and partly broken away to save space in the drawings. Fig.2 is a transverse section, taken on line 2 2 2 of Fig.

1 looking toward the right in said figure, of the right-hand half of asteam-generator constructed in accordance with our invention, the stackbeing broken away in Figs. 1 and 2 to save space in the drawings. Fig. 3is a detail section, taken on line 3 3 3, illustrating the arrangementof the water-tubes connecting the steam-drum and two of the waterdrums.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, 10 is a steam-drum of wellknown construction, beingabout half filled with water 11, the steam generated collecting in theupper portion of said steam-drum and passing out through the outlet-pipe12.

Directly beneath the steam-drum 10 and centrally located therewith is awater-drum 13. At each side of the drum 13 is a grate 14, and outsideeach of the grates 14 is a waterdrum 15, the center of said water-drums15 being located in the same horizontal plane as the center of thewater-drum 13. The waterdrum 13 is connected to the steam-drum 10 at thebottom thereof by a set of bent tubes 16, arranged in series, as shownin Fig. 2, the tubes 17 and 25 being arranged in close juxtaposition toeach other by bending said tubes 25 immediately after they leave thesteamdrum 10 and water-drum 13 (see Fig. 2) into line with the tubes17,and thus formingatubnlous side Wall 24 to the combustion-chamber 9o18, located above thegrate 14. Between the tubes 17 and thecombustion-chamber 18 are three series of staggered tubes 19 The tubes17 and 19 all constitute uptake-tubes conducting the water from the drum13 to the 5 steam-drum 10.

Water is supplied to the boiler through a supply-pipe 20, which entersthe front of the steam -drum 10 and passing through said steam-drumdelivers water to a vertical water-pipe 21, which passes outwardly fromthe lower and rear end of the steam-drum and downwardly to connect withthe rear end of the water-drum 13. The water-pipe 21 is connected byhorizontal water-pipes 22 at the lower end thereof to the rear end andcenter of each of the water-drums 15. The waterdrums 15 are eachconnected by a set of bent tubes 23 to the under side of the steam-drum10. Said bent tubes are formed in a curved or arched shape and projectfrom the outside of the grates 14 inwardly toward said steamdrum andover said grates. The set of bent tubes 23 is arranged in a number ofseries, as shown in Figs. 2 and 3, extending from the front to the rearof the steam-generator.

The tubulous wall 26 is formed (adjacent to the combustion-chamber 18and extending from the front end of the steam-drum to a point near therear end thereof) by bending between the tubes 27 another series oftubes 28, said tubes 28 being bent between the said tubes 27 and inclose juxtaposition thereto immediately after leaving the water-drum andthe steam-drum 10, as shown in Fig. 2. At the rear end of thecombustion-chamber the tubulous wall thus formed ends and the tubes areleft open, as shown in Fig. 3, to allow the heated gases from thecombustionchamber 18 to pass into the return-flue 29. The opposite wallof the return-flue 29 is formed by a second tubulous wall 30, extendingfrom the rear end of the set of tubes 23 to near the front end of saidset, said tubulous wall being formed by bending the tubes of one seriesbetween the tubes of another series, as hereinbefore described. A thirdtubulous wall 31 is also provided,parallel to and of equal length withthe tubulous wall 30 and extending from the rear end of the set of tubes23 to a point near the front end thereof. Between the tubulous walls 30and 31 is a space or chamber The entrance 33 to said flue 29 and theexit 341 from said flue are filled with tubes staggered, as shown inFig. 3, which allow the heated gases to pass from the combustion-chamber18 through the flue 29 into a fine 35 and thence upward and outwardthrough the stack 36.

The steam-drum 10 and the water-tubes leading from said steam-drum tothe waterdrums are inclosed by a casing 37, which extends across the twoends of the boiler and the sides thereof. A plate 38 extends from theouter tubes in the set 23 to the side plat-es ot' the casing 37, Figs. 1and 2, and forms the rear wall of the flue 35. The front and rear endsof the combustion-chamber 18 are constructed of fire-brick, havingopenings 40 therein, which extend in both the front and rear walls ofsaid combustion-chamber into chambers 4:1 and 42, respectively. Thechamber 42 connects with the ash-pit 13 through a passage 44, thechamber 11 communicating directly with the front portion of said ashpit,Fig. 1.

The operation of our improved steam-gem erator is as follows: A portionof the air admitted into the ash-pit passes up through the grate 14:into the combustion-chamber 18, mixing with the heated gases, and aportion of said air passes to the rear of said ash-pit through thepassage 44111170 the rear chamber 42 and through openings 40 in thefire-brick 39 into the rear end of the combustion-chamber 18. Anotherportion of the air passes from the ash-pit entrance directly into thefront chamber 4L1 and through the openings 40 in the front fire-brickwall to said combustion-chamber 18. The heated gases and products ofcombustion then pass through the entrance 33 to the returiiaflue 20 andforward through said return-flue and outwardly therefrom at the frontend thereof through the exit 34 to the flue 35, passing upwardly fromsaid flue 35 to the stack 36.

It will be seen that the tubulous wall26 forms one side of the chamber18 and also forms the inner side of the return-flue 20. It will also beseen that the tubulous wall 30 forms the outer wall of the return-flue29 and the inner wall of the gas-chamber 32, the tubulous wall 31forming the outer wall of said chamber 32. It will be seen that all ofthe tubes in the set of tubes 16 constitute uptakes, as they all comeinto direct contact with the heated gases from the combustionchamber 18,and that all of the tubes in the set 23 constitute nptakes with theexception of the tubes forming the tubulous wall 31. Said tubes 31(being separated from theheated gases by the series of tubes in thetubulous wall 30 and by the non-conducting air or gas chamber 32,located between the walls 30 and 31) constitute downtakes. It is evidentthat the number of tubes in the wall 31 may be increased, if desired.This arrangement of the tubes leading from the water-drums 15 to thesteam-drum lO-that is, a portion of said tubes constituting uptakes anda portion downtakes-secures a very thorough and complete circulationbetween said water-drums and said steam-drum. As all the tubes leadingfrom the water-drum 13 to the steamdrum 10 are uptakes, the verticaldowntakepipe 21 is necessary, and while we have illustrated horizontalwater-pipes 22, leading from said pipe 21 to the rear end of each of thewater-dru ms 15 it is evident that such horizontal water-pipes may bedispensed with and the entire circulation of water from the waterdrums15 to the steam-drum 10 and return be accomplished through the benttubes constituting the set of tubes 23.

Having thus described our invention, what We claim, and desire byLetters Patent to secure, is

1. In a steam-generator, a steam-drum, a water-drum beneath saidsteam-drum, and bent tubes connecting said water-drum to the bottom ofsaid steam-drum, one series of said tubes arranged in closejuxtaposition to each other and constituting uptakes, a second series ofsaid tubes arranged in close juxtaposition to each other andconstituting downtakes, said first and second series of tubes formingside Walls of a gas-chamber located therebetween and acting as anon-conductor of heat. 7

2. In a steam-generator, a steam-drum, a

grate beneath said steam-drum, a water-drum at each side of said grate,a set of bent tubes connecting each of said water-drums with the bottomof said steam-drum, the tubes in one series of one of said sets of tubesarranged in close juxtaposition to each other and constituting uptakes,a second series of tubes arranged in close juxtaposition to each otherand constituting downtakes, said first and second series of tubesconstituting side Walls of a gas-chamber located therebetween and actingas a non-conductor of heat.

3. In a steam-generator, a steam-drum, a

steam-dru m, a grate at each side of said waterdrum, a water-drumoutside each of said grates, a series of bent tubes connecting saidWater-drums to the bottom of said steamdrum, the bent tubes connectingsaid centrally-located Water-d rum to said steam-d ru mconstitutinguptakes, a portion of the bent tubes connecting the other water-drums tosaid steam-drum constituting uptakes and arranged in such a manner as toshield another portion of said tubes which constitute downtakes, acasing inclosing said tubes, and a vertical downtake-pipe outside'saidcasing connecting said steam-drum to said central Water-drum.

5. In a steam-generator, a steam-drum, a water-drum centrally locatedbeneath said steam-d rum, agrate at each side of said Waterdrum, awater-drum outside each of said grates, a series of bent tubesconnecting said water-drums to the'bottom of said steamdrum, the benttubes connecting said central water-drum to said steam-drum constitutinguptakes, a portion of the bent tubes connecting the other Water-drums tosaid steamdrum constituting uptakes and arranged in such a manner as toshield another portion of said tubes which constitute downtakes, a

casing inclosing said tubes, a vertical downtake-pipe outside saidcasing connecting said steam-drum to said'central water-drum, andhorizontal water-pipes outside said casing connecting said water-drums.

6. In a steam-generator, a steam-drum, a grate beneath said steam-drum,a water-drum at each side of said grate, a set of bent tubes connectingeach of said water-drums with the bottom of said steam-drum, one of saidsets of tubes having three series of tubes arranged in closejuxtaposition with each other and forming tubulous walls extendinglongitudinally of said steam-drum, the first of said series extendingfrom the front to near the rear of said steam-drum and constituting aside wall of uptakes for the combustion-chamber and for a return-flueparallel to said combustion-chamber, the second of said seriesextendingfrom the rear of said steam-drum to near the front thereof andconstituting a side wall of uptakes for said flue, and the third of saidseries extending from the rear of said vchamberto near the front thereofand constituting a side wall of downtakes for said gas-chamber,substantially as described for the purpose specified.

7. In a steam-generator, a steam-drum, a grate beneath said steam-drum,a water-drum at each side of said grate, a set of bent tubes connectingeach of said Water-drums with the bottom of said steam-drum, one of saidsets of tubes having three series of tubes arranged in closejuxtaposition with each other and' forming tubulous walls extendinglongitudinally of said steam-drum; the first of said series extendingfrom the front to near the rear of said steam-drum and constituting aside wall of uptakes for the combustion-chamber and for a return-flueparallel to said combusti'on-chamber; the second of said seriesextending from the rear of said steam-drum to near the front thereof andconstituting a side Wall of uptakes for said flue; and the third of saidseries extending from the rear of said chamber to near the front thereofand constituting a side wall of downtakes for said gas-chamber; theremainder of tubes'in said set arranged with spaces therebetweenin saidflue in the opening into said due from said combustion-chamber and inthe exit from said flue to a second flue leading to the stack of saidsteam-generator..

In testimony whereof we have hereunto set our hands in presence'of twosubscribing witnesses.

FRANK O. WELLINGTON. CHARLES B. EDWARDS.

